Chester climate

Chester Weather in August

NOAA 1991-2020 normals for Kaskaskia Rvr Navigation Lock, 13.4 km from Chester

Average highs run from 89°F on August 1 to 86°F on August 31, and lows from 68°F to 63°F. Normal precipitation for the month is 3.34 in over about 7 wet days.

August day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Chester, in °F, with the record for each date.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
88°F
Average low
66°F
Precipitation
3.34 in
Record high
109°FAug 17, 1988
Record low
41°FAug 29, 1986
Chance of a freeze
0%
Days of 90°F or more
15.4
Daylight
14 h 05 min to 13 h 02 min
Cloud cover
47%
Humidity
69%
Dew point
65°F
Wind
5.6 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Aug 189°F68°F106°F 198053°F 199224%0%
Aug 289°F68°F101°F 199756°F 199224%0%
Aug 389°F68°F104°F 198755°F 202524%0%
Aug 489°F67°F104°F 199154°F 198624%0%
Aug 589°F67°F101°F 200252°F 197424%0%
Aug 689°F67°F102°F 198954°F 202023%0%
Aug 789°F67°F104°F 198848°F 199023%0%
Aug 889°F67°F101°F 198750°F 198923%0%
Aug 989°F67°F100°F 198049°F 198923%0%
Aug 1089°F67°F105°F 198050°F 198923%0%
Aug 1189°F67°F103°F 200752°F 198923%0%
Aug 1288°F66°F102°F 201049°F 200423%0%
Aug 1388°F66°F104°F 200749°F 200423%0%
Aug 1488°F66°F99°F 200549°F 200423%0%
Aug 1588°F66°F107°F 198849°F 200423%0%
Aug 1688°F66°F103°F 198850°F 200423%0%
Aug 1788°F66°F109°F 198852°F 200423%0%
Aug 1888°F66°F104°F 198851°F 201222%0%
Aug 1988°F65°F103°F 199553°F 201222%0%
Aug 2088°F65°F103°F 199055°F 198122%0%
Aug 2187°F65°F102°F 198354°F 197822%0%
Aug 2287°F65°F104°F 198350°F 202422%0%
Aug 2387°F65°F102°F 198349°F 202422%0%
Aug 2487°F64°F103°F 198955°F 200921%0%
Aug 2587°F64°F100°F 197853°F 201521%0%
Aug 2687°F64°F101°F 202349°F 202521%0%
Aug 2787°F64°F100°F 198349°F 202521%0%
Aug 2886°F64°F103°F 198348°F 198621%0%
Aug 2986°F63°F103°F 198341°F 198621%0%
Aug 3086°F63°F103°F 198444°F 198621%0%
Aug 3186°F63°F102°F 198446°F 198621%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Chester, in percent, and of at least 0.1 inch of snowfall.05101520251102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

August 1
sunrise 6:03 AM, sunset 8:08 PM
August 31
sunrise 6:28 AM, sunset 7:30 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00114629 (Kaskaskia Rvr Navigation Lock), public domain. Records: NOAA GHCN-Daily, station USC00114629, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.